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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Secure Component */
/** */
/** Transport Layer Security (TLS) - Generate Session Keys */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_session_keys_set PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sets the session keys for a TLS session following the */
/* sending or receiving of a ChangeCipherSpec message. In */
/* renegotiation handshakes, two separate set of session keys will be */
/* in use simultaneously so we need this to be able to separate which */
/* keys are actually in use. */
/* */
/* Once the keys are set, this function initializes the appropriate */
/* session cipher with the new key set. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* key_set Remote or local keys */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_secure_session_keys_set] Set session keys */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* _nx_secure_tls_client_handshake TLS client state machine */
/* _nx_secure_tls_server_handshake TLS server state machine */
/* _nx_secure_tls_process_changecipherspec */
/* Process ChangeCipherSpec */
/* */
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
UINT _nx_secure_tls_session_keys_set(NX_SECURE_TLS_SESSION *tls_session, USHORT key_set)
{
UINT status;
UINT is_client;
if (key_set == NX_SECURE_TLS_KEY_SET_LOCAL)
{
tls_session -> nx_secure_tls_local_session_active = 1;
}
else
{
tls_session -> nx_secure_tls_remote_session_active = 1;
}
/* See if we are setting server or client keys. */
if ((key_set == NX_SECURE_TLS_KEY_SET_REMOTE && tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_CLIENT) ||
(key_set == NX_SECURE_TLS_KEY_SET_LOCAL && tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_SERVER))
{
/* Setting remote keys for a client or local keys for a server: we are setting server keys. */
is_client = NX_FALSE;
}
else
{
/* Local client/local keys or local server/remote keys. */
is_client = NX_TRUE;
}
if (tls_session -> nx_secure_tls_session_ciphersuite == NX_NULL)
{
/* Likely internal error since at this point ciphersuite negotiation was theoretically completed. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}
/* Set client or server write key. */
if (is_client)
{
status = tls_session -> nx_secure_session_keys_set(tls_session -> nx_secure_tls_session_ciphersuite, &tls_session -> nx_secure_tls_key_material,
sizeof(tls_session -> nx_secure_tls_key_material.nx_secure_tls_key_material_data),
is_client, &tls_session -> nx_secure_tls_session_cipher_client_initialized,
tls_session -> nx_secure_session_cipher_metadata_area_client, &tls_session -> nx_secure_session_cipher_handler_client,
tls_session -> nx_secure_session_cipher_metadata_size);
}
else
{
status = tls_session -> nx_secure_session_keys_set(tls_session -> nx_secure_tls_session_ciphersuite, &tls_session -> nx_secure_tls_key_material,
sizeof(tls_session -> nx_secure_tls_key_material.nx_secure_tls_key_material_data),
is_client, &tls_session -> nx_secure_tls_session_cipher_server_initialized,
tls_session -> nx_secure_session_cipher_metadata_area_server, &tls_session -> nx_secure_session_cipher_handler_server,
tls_session -> nx_secure_session_cipher_metadata_size);
}
return(status);
}
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